Portion of a shoe



FIG. 1 is a front view of a portion of a shoe showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a left side view thereof.

The broken line showing of portions of the shoe and shoe sole are for the purpose of illustrating portions of the shoe and shoe sole, which form no part of the claimed design. 

The ornamental design for a portion of a shoe, as shown and described. 